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385 million years ago, a group of fish would undertake one of the most important journeys in the history of life and become the first vertebrates to live on dry ground. But first, they had to acquire the ability to breathe air.

Thanks to Ceri Thomas for the Ichthyostega reconstruction. Check out more of Ceri's paleoart at http://alphynix.tumblr.com and http://nixillustration.com

And thanks as always to Nobumichi Tamura for allowing us to use his wonderful paleoart: http://spinops.blogspot.com/

Lastly, this episode (as well as most episodes of Eons) features beautiful paleoart from Studio 252mya. We dare you to try to not spend hours looking at their work: http://252mya.com

Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios